Oil Injection Research Articles

Experimental Investigation on the Effect of Water Cooling on a Dry Twin-Screw Air Compressor for Proton Exchange Membrane Fuel Cells

Due to the lack of oil injection cooling, it is usually necessary for dry twin-screw compressors to design cooling jackets to carry away the heat generated during operation. In order to investigate to what extent a cooling jacket can improve the performance of screw compressors, this study set up an experimental platform for a dry twin-screw compressor applied in fuel cell vehicles and used water as the working liquid in the cooling jacket. Then, the performance parameters of the screw compressor under different rotating speeds, discharge pressures, and cooling water flow rates were measured. It can be considered that the existence of a water cooling jacket is of great significance for improving the performance of dry screw compressors and improving extreme operating conditions. The research results may provide a reference for the development and improvement of dry twin-screw compressors in the future.

Efficacy of 5-fluorouracil (5-FU) and low molecular weight heparin (LMWH) in high-risk pediatric retinal detachment; randomized clinical trial

BackgroundPediatric rhegmatogenous retinal detachments (PRRDs) are complex, rare occurrences and are often related to trauma or congenital abnormalities. Children often do not recognize or report symptoms of retinal detachment. Thus at presentation, PRRD is typically advanced often with macular involvement, proliferative vitreoretinopathy (PVR), chronic duration, and poor visual acuity. Because 5-FU and LMWH are effective in different aspects in the PVR process, it was believed that a syngergistic approach to the prevention of PVR would be advantageous.MethodsAfter informed consent, children under 14 years of age with high-risk PRRD underwent pars plana vitrectomy and silicone oil injection with scleral buckle divided into 2 groups in prospective randomized trial. Group A received intraoperative infusion of 5-FU (200 µg/ml) and LMWH (5 IU/ml), group B received infusion of normal saline. Primary outcome was occurrence of recurrent PRRD within 12 weeks, secondary outcomes were occurrence of PVR, best corrected visual acuity (BCVA), number and timing of secondary procedures within 12 weeks.ResultsThe study included 42 eyes of 41 patients, 21 in group A and 21 in group B, the duration of PRRD ranged from 0.5 to 7 months in group A and 0.25-5 months in group B.The rate of recurrent PRRD was higher in group B 33% compared to 19% in group A (p = 0.292). The mean timing of occurrence of recurrent PRRD was 9.5 ± 5 weeks in group A compared to 2.86 ± 2.41 weeks in group B (p = 0.042), more patients in group B ended up with more advanced PVR (p = 0.038), BCVA was hand movement (HM) only in all cases preoperatively and improved to HM-0.3 Snellen in group A compared to light perception (PL)-0.1Snellen in group B (p = 0.035), there was no difference in any of secondary procedures but with later timing in group A 9.71 ± 3.73 weeks than in group B 4.0 ± 2.83 weeks (p = 0.042).ConclusionThis study concluded that the use of the 5-FU and LMWH combination in high risk PRRD resulted in lower rate of postoperative PVR, later recurrence of PRRD and better final BCVA.Trial registration numberRegistry: clinicaltrials.gov PRS NCT06166914 date of initial release 4/12/2023. Unique Protocol ID: 9,163,209 date 21/10/2021. Retrospectively registered

Unveiling the Impact of Nandrolone Decanoate on Kidney and Heart of Rattus Norvegicus

Background: The use of anabolic androgenic steroids (AAS) like Nandrolone Decanoate (ND) for enhancing physical performance and muscle growth is prevalent among athletes and non-athletes. However, the adverse effects of AAS on organ systems, particularly the kidney and heart, have been a growing concern within the medical and scientific community. Previous studies have highlighted the potential nephrotoxic and cardiotoxic effects of these substances, necessitating further research to elucidate the extent of organ damage. Objective: This study aims to investigate the histopathological effects of ND on the kidney and heart tissues of Rattus norvegicus and to draw comparisons with control groups to assess the severity of organ damage. Methods: A total of 15 Rattus norvegicus were divided into three groups: a control group, an olive oil group (positive control), and a steroid group (ND treated). The animals were housed under controlled conditions with a 12-hour light/dark cycle at 23±2°C. The steroid and olive oil groups received 50mg/ml intramuscular injections of ND and olive oil, respectively, twice weekly for six weeks. Following treatment, the animals were euthanized, and their kidney and heart tissues were extracted for histological examination. Tissues were fixed in 10% formalin, processed, and stained with Hematoxylin and Eosin (H&E) for microscopic evaluation. Results: Histological analysis revealed significant alterations in the ND-treated group compared to controls. Kidney tissues from the ND group exhibited tubular dilation, epithelial degeneration, and necrosis with a noticeable increase in Bowman's space and vascular congestion. Quantitatively, tubular atrophy and degeneration were observed in 80% of the ND-treated animals, compared to none in the control and olive oil groups. Heart tissues in the ND group showed evidence of myocardial fibrosis and necrosis, with myocardial fibrosis observed in 70% of the steroid-treated animals, significantly higher than the control groups. Conclusion: The administration of Nandrolone Decanoate in Rattus norvegicus significantly impacts kidney and heart histology, underscoring the potential health risks associated with AAS use. These findings contribute to the growing body of evidence on the nephrotoxic and cardiotoxic effects of steroids, emphasizing the need for caution and further research in human healthcare to develop safer therapeutic alternatives.

Effects of reservoir fluids on sand packs consolidated by furan and epoxy resins: Static and dynamic states

One of the most effective methods for sand control is the chemical consolidation of sandstone structures. In this paper, the impacts of crude oil and brine in the static state and the impact of the flow rates of the fluids in the dynamic state have been assessed at the reservoir conditions. The analyses in this research were Young's modulus, compressive strength, porosity, and permeability which were done on core samples after and before fluid contact. Samples made with two different resins showed good resistance to crude oil in both states. No considerable change was seen in the analyses even at high crude oil injection rates in the dynamic state. Conversely, brine caused a noticeable change in the analyses in both states. In the presence of brine at the static state, Young's modulus and compressive strength respectively decreased by 37.5% and 34.5% for epoxy cores, whereas these parameters respectively reduced by 30% and 41% for furan cores. In brine presence at the dynamic state, compressive strength reduction was 10.28 MPa for furan and 6.28 MPa for epoxy samples and their compressive strength reached 16.75 MPa and 26.54 MPa respectively which are higher than the critical point to be known as weak sandstone core. Moreover, Young's modulus decrease values for furan and epoxy samples were respectively 0.37 GPa and 0.44 GPa. Therefore, brine had a more destructive effect on the mechanical characteristics of samples in the static state than the dynamic one for two resins. In addition, brine injection increased permeability by about 13.6% for furan and 34.8% for epoxy. Also, porosity raised by about 21.8% for furan, and 19% for epoxy by brine injection. The results showed that the chemical sand consolidation weakens in the face of brine production along with crude oil which can lead to increasing cost of oil production and treating wellbore again.

The impact of well spacing on three-dimensional in situ extraction of oil shale using high-temperature air injection

To explore the impact of well spacing on the in situ high-temperature air injection for three-dimensional shale oil recovery, this study constructed six different well-spacing physical models of shale oil for investigation. By comparing factors such as temperature distribution, cumulative oil production volume, heating rate factor, and specific energy consumption per unit volume of shale oil among the six different well-spacing models, the influence of well spacing on the in situ high-temperature air injection for three-dimensional shale oil recovery was analyzed. The results showed that all six shale oil models exhibited a ripple pattern, advancing along the fractured fissures from the heating well to the production well. Model I, Model II, Model III, Model IV, Model V, and Model VI completed the full decomposition of the shale region at 2610, 1530, 1800, 3510, 4050, and 6660 days, respectively. The heating rate factor reached its peak at 1800, 900, 1440, 2340, 3240, and 3960 days. Model III had the lowest specific energy consumption per unit volume of shale oil, which was 905.41 kW/m3. Using Model III for three-dimensional shale oil injection with high-temperature air in situ recovery will shorten the heating time and reduce heat loss.

Study on Heat Transfer Characteristics of High-Speed Herringbone Gear in Meshing Process Under Oil Injection Lubrication

Abstract To quantify the relationship between the total frictional heat and the absorbed heat by the oil film in the herringbone gear transmission, this article investigates the lubrication status and thermal characteristics of the tooth meshing point under the fuel injection condition. First, the contact analysis of the herringbone gears is carried out—studying the variation pattern of the maximum pressure, highest temperature rise, and minimum film thickness of different oil films at various mesh points along the meshing line. Second, the friction coefficient and frictional power for the meshing points on the tooth surface are calculated to determine the ratio of oil film pressure to total pressure distribution. This completes the allocation of frictional power for the meshing points of the driving and driven gears. Finally, by comparing the total heat generated by frictional shear with the heat absorbed by the oil film, the numerical relationship between the two can be quantified.

Gut microbiota contributes to bisphenol A-induced maternal intestinal and placental apoptosis, oxidative stress, and fetal growth restriction in pregnant ewe model by regulating gut-placental axis

BackgroundBisphenol A (BPA) is an environmental contaminant with endocrine-disrupting properties that induce fetal growth restriction (FGR). Previous studies on pregnant ewes revealed that BPA exposure causes placental apoptosis and oxidative stress (OS) and decreases placental efficiency, consequently leading to FGR. Nonetheless, the response of gut microbiota to BPA exposure and its role in aggravating BPA-mediated apoptosis, autophagy, mitochondrial dysfunction, endoplasmic reticulum stress (ERS), and OS of the maternal placenta and intestine are unclear in an ovine model of gestation.ResultsTwo pregnant ewe groups (n = 8/group) were given either a subcutaneous (sc) injection of corn oil (CON group) or BPA (5 mg/kg/day) dissolved in corn oil (BPA group) once daily, from day 40 to day 110 of gestation. The maternal colonic digesta and the ileum and placental tissue samples were collected to measure the biomarkers of autophagy, apoptosis, mitochondrial dysfunction, ERS, and OS. To investigate the link between gut microbiota and the BPA-induced FGR in pregnant ewes, gut microbiota transplantation (GMT) was conducted in two pregnant mice groups (n = 10/group) from day 0 to day 18 of gestation after removing their intestinal microbiota by antibiotics. The results indicated that BPA aggravates apoptosis, ERS and autophagy, mitochondrial function injury of the placenta and ileum, and gut microbiota dysbiosis in pregnant ewes. GMT indicated that BPA-induced ERS, autophagy, and apoptosis in the ileum and placenta are attributed to gut microbiota dysbiosis resulting from BPA exposure.ConclusionsOur findings indicate the underlying role of gut microbiota dysbiosis and gut-placental axis behind the BPA-mediated maternal intestinal and placental apoptosis, OS, and FGR. The findings further provide novel insights into modulating the balance of gut microbiota through medication or probiotics, functioning via the gut-placental axis, to alleviate gut-derived placental impairment or FGR.DorkkcsjvJM4thb48aSHyrVideo

Analisis Kinerja Kompressor Screw Oil Injected Sullair Ls20-150h untuk Ash Handling (Study Kasus PLTU Teluk Sirih)

PLTU Teluk Sirih is a coal-fired steam power plant as an energy source that produces ash with a capacity of 2 . The compressor is a medium for transferring ash by using compressed air. The compressor used is a SCREEW OIL INJECTED SULLAIR LS20-150H compressor. Currently there is a decrease in performance on the compressor, which initially had a compression ratio of 1,600 Psia, polytropic head 14,500,599, capacity 10,938,438, flow rate 11,379,622 lb/s, efficiency 98.5%. After analyzing this compressor, the data obtained was a compression ratio of 1,540 Psia, polytropic head 13,805,166, capacity 10,950,733, flow rate 11,392,412, and efficiency of 95.3%. The reason is because the compressor room area does not have an active blower so that dirt/ash stuck to the radiator fins causes heat transfer to be hampered and this greatly affects the performance of the compressor parts to work optimally

Power Loss Analysis of an Oil-Jet Lubricated Angular Contact Ball Bearing: Theoretical and Experimental Investigations

This study presents a theoretical and experimental analysis to quantify the power losses generated by an oil jet lubricated angular contact ball bearing. The analysis is conducted for a moderate speed range (N∙dm product less than 106) and a limited applied load (<5% of the static capacity). The lubrication regime of each ball is studied through a theoretical model and varies from Iso-Viscous Rigid to Elasto-Hydrodynamic. Therefore, the hydrodynamic effects are considered in the power loss calculation. An experimental campaign is carried out and the influence of several parameters (applied load, oil injection temperature, speed, etc.) is studied. A good agreement is found between the developed model and the measurements. It is shown that the radial applied load has no influence on power losses, unlike speed and axial load. This can be explained by the load distribution and the hydrodynamic rolling contribution on the low loaded balls.

Restoration of vision in kniest dysplasia patients characterized by retinal detachment with dialysis of the ora serrata

A 23-year-old male patient visited our Eye Institute for “retinal detachment with dialysis of the ora serrata in left eye”. Through high-throughput exon sequencing, he was correctly diagnosed with Kniest dysplasia caused by the COL2A1 gene mutation. The retina was successfully reattached, and the vision recovered to 20/25 after pars plana vitrectomy and silicone oil injection. Retinal detachment in Kniest dysplasia is the most serious ocular complication. In order to prevent blindness, early diagnosis and regular eye examination are necessary. If a retinal detachment is found, pars plana vitrectomy to reattach the retina as soon as possible is an effective treatment.

Raised Intraocular Pressure Secondary to Vitreoretinal Procedures: A Literature Review

The anatomical proximity of anterior and posterior segment structures and the familiar microcirculatory milieu make both susceptible to arduous complications when either is surgically handled. Because of the complex haemodynamic reciprocity between vitreous, retina, choroid, and aqueous humour, any trivial alteration in one can present a catastrophic consequence in the other. A good number of evidence.based studies have already substantiated that postoperative rise in intraocular pressure (IOP) is a well-recognised complication after vitreoretinal surgeries like scleral buckling, pars plana vitrectomy (PPV), intravitreal gas and silicon oil injection as well as intravitreal steroid and antivascular endothelial growth factor (VEGF) injection. The cause is multifactorial. Determining the cardinal pathophysiological mechanism is very decisive as it provides the ultimate guide to opting for the suitable treatment modality. The superimposing clinical features mystify the diagnosis, and pre.existing conjunctival scars and episcleral explants make any further surgical management very tough. In many cases, anti-glaucoma medications are beneficial for managing the temporary rise in IOP. However, the options of laser treatment and filtration surgeries can be considered in resistant cases, and glaucoma drainage devices are the last resort for refractory patients where filtration surgeries fail. In this review, we provide fundamental insight into the possible pathogenic mechanisms, specifically focusing on how to discriminate among them and strategically approach the management with secondary elevation in IOP following vitreoretinal surgeries.

Retinal detachment and microvasculopathy in HIV patients with cytomegalovirus retinitis: A case series

We report two cases of bilateral rhegmatogenous retinal detachment (RRD) associated with cytomegalovirus retinitis (CMVR) in human immunodeficiency virus (HIV) patients, treated with 23G pars plana vitrectomy (PPV), endolaser (EL), and silicon oil injection (SOI). Both patients had retinal microvasculopathy changes and were managed for postoperative cystoid macular edema (CME). Our cases highlight the challenges in treating RRD associated with CMVR in HIV patients and the importance of close follow-up for these patients.

Clinical pattern and outcomes of acute retinal necrosis in a referral Center in Tunisia, North Africa: A 17‐year retrospective study

Aims/Purpose: To describe the pattern of acute retinal necrosis (ARN) in a referral centre in Tunisia, North Africa.Methods: The charts of 22 patients diagnosed with ARN from January 2006 to January 2023 were retrospectively reviewed.Results: The mean age at presentation was 39.2 (range, 12–70) years, sex ratio was 1.75. The mean diagnostic delay was 17.9 days (range 1–60). The mean visual acuity at presentation was 20/400. All patients presented with a mild to moderate anterior uveitis (100%) with granulomatous keratic precipitates in 18 eyes (81%) and ocular hypertension in 4 eyes (18%). Necrotizing retinitis involved >50% of the retina in 36.5%of eyes. Polymerase chain reaction on aqueous humour sample identified varicella zoster virus in 10 eyes (45%), herpes simplex virus‐1 in 4 eyes (18%) and was negative in 8 eyes (22%). All patients received intravenous acyclovir, followed by oral antivirals. Intravitreal injections of ganciclovir were administered in 12 eyes (54.5%). Follow‐up ranged from 1 month to 48 months. The mean final visual acuity was 20/200. Complications included retinal detachment (RD) (31.8%), macular oedema (18%), macular atrophy (22%), epimacular membrane (22%), cataract (27%), optic nerve atrophy (18%) and central retinal artery occlusion (4%). No patient developed bilateral ARN. Prophylactic laser was performed in 7 eyes (32%). RD was treated with pars plana vitrectomy and silicone oil injection in 7 eyes.Conclusions: ARN syndrome in Tunisia is most commonly caused by VZV.

Macular edema after surgery to treat rhegmatogenous retinal detachment: 1-year follow-up, incidence, and associated risk factors.

To clarify the postoperative incidence of macular edema in patients undergoing surgery to repair rhegmatogenous retinal detachment and identify the associated risk factors. In this prospective, observational study, 79 patients who underwent surgery to correct rhegmatogenous retinal detachment using pars plana vitrectomy with silicone oil injection were analyzed. Patients were followed up postoperatively at 7, 30, 90, 180, and 365 days. At each visit, optical coherence tomography was performed to assess the presence or absence of macular edema. were analyzed as possible risk factors for macular edema: age, sex, macular status (attached or detached), presence of vitreoretinal proliferation, history of previous intraocular surgery, reported time of symptoms suggestive of rhegmatogenous retinal detachment up to the date of surgery, and the surgical modality performed. The 1-year macular edema prevalence rate was 26.6%. In the adjusted analysis, older patients had a higher risk of macular edema, and each 1-year increase in age increased the risk of macular edema by 6% (95% confidence interval = 1.00-1.12). The macular status, vitreoretinal proliferation, the surgical technique used, prior intraocular surgery, and the intraocular lens status were not identified as risk factors. However, the incidence of macular edema increased up to 180 days after surgery, peaking at 10.6%, and then decreased until 365 days after surgery. Macular edema was a common complication after surgery to treat rhegmatogenous retinal detachment, with its incidence peaking between 30 and 180 days after surgery. Age was an important risk factor for macular edema in this cohort.

Дослідження впливу змінного електромагнітного поля на трибологічні властивості моторних олив

A set of studies was conducted on the influence of mechanical, thermal and electromagnetic factors under the action of the variable electromagnetic field of the oil pumping device on the properties of M-6В3 motor oils; M-10Г; M-10Г2. The research was carried out on a special stand, which allows to simulate the operating conditions of the oil injection device on the car engine during the start-up period. The evaluation of the efficiency of the oil pumping device was determined by the volume and effective coefficients of the useful action. In the process of research, oils (fresh and used) that were exposed to an alternating electromagnetic field and oils that were not exposed to the corresponding influence were compared according to the main physicochemical properties: kinematic viscosity at temperatures of 373, 323, 293, 273 and 258 K; solidification temperature of oil, K; viscosity index; ash content, %; the content of refractory mechanical impurities, %; iron content, %. The results were obtained on the effect of an alternating electromagnetic field on the viscosity-temperature parameters of fresh M-6В3 oils; M-10Г; M-10Г2. In the temperature range of 293...323 K, a decrease in the viscosity of the studied oils was observed. An increase in temperature eliminates the difference between processed and unprocessed oils. The effect of the duration of the alternating electromagnetic field on the viscosity index of the studied oils at a temperature of 258 K was studied. The optimal duration of olive processing was determined, which is 9...12 minutes, depending on its organic basis and the presence of additives in it. The characteristics of changes in the viscosity-temperature characteristics of the studied oils after certain periods of time after the action of a variable electromagnetic field on them were analyzed. It has been confirmed that these characteristics of processed oils are approaching the similar characteristics of untreated oils over time, except for M-6В3 oil, which stably retains the acquired properties even after a long time of its processing. With the use of a special installation that simulates the work of tribo-coupling "cam-pusher", the influence of an alternating electromagnetic field on the anti-wear and anti-seize properties of the studied oils was investigated. A 1.2-1.5 times reduction in the amount of wear of both the working surfaces of the pushers and the cams was noted, in the absence of varnish deposits on them.

OUTCOMES OF PRIMARY UNCOMPLICATED RHEGMATOGENOUS RETINAL DETACHMENT REPAIR USING SILICONE OIL TAMPONADE IN VITREORETINAL SURGERY

In a prospective observational study, we aimed to determine anatomical and functional outcomes, as well as possible complications, following pars plana vitrectomy (PPV) with silicone oil (SO) tamponade for primary, uncomplicated rhegmatogenous retinal detachments. This study was conducted from August 2023 to November 2023. During the study, 32 patients underwent surgical repair through PPV and SO injection. PPV over scleral buckling was chosen when cataracts or vitreous hemorrhages hindered proper fundus visualization. Patients received comprehensive ocular assessments, including best-corrected visual acuity, anterior segment examination, IOP measurements via applanation, and fundus examinations at different intervals: 1 day, one week, one month, and three months. Intraocular pressure exceeding 21 mmHg was defined as increased IOP. Our study included 32 patients (22 men and ten women) of Asian ethnicity who underwent retinal detachment repair by PPV and SO injection. The patients had an average age of 57.8 ± 10.1 years (34–76 years) at the time of intervention. The follow-up period was three months. An anatomical success rate, defined as retinal reattachment three months after SO removal, was achieved in 29 eyes (90.6%). Final best-corrected visual acuity (BCVA) improved 26 looks (81.2%), with a mean gain of 3 Snellen lines. BCVA remained unchanged in 4 eyes (12.5%) and deteriorated in 2 eyes (6.3%), with a mean loss of 2 Snellen lines. During the 3-month follow-up period, 17 eyes (53.1%) experienced increased intraocular pressure (IOP). Out of these, 15 patients had transient ocular hypertension, requiring topical treatment during the immediate postoperative period (within one month). Only one eye (5.9%) required filtrating drainage surgery for IOP control. Notably, no eyes developed optic neuropathy due to elevated IOP during this short-term follow-up. Pars plana vitrectomy (PPV) combined with silicone oil (SO) injection is a safe and effective surgical approach for treating primary uncomplicated rhegmatogenous retinal detachment. Our series indicates that PPV and SO injection lead to good anatomical and functional outcomes, with high reattachment rates and low rates of proliferative vitreoretinopathy. Although cataract formation and elevated intraocular pressure (IOP) are common complications, they can be successfully controlled.

Zespół Sticklera – opis przypadku i analiza literatury

PurposeTo present a case of patient with Stickler syndrome and retinal detachment with crystalline lens subluxation.Material and MethodsRetrospective case report.ResultsA 9-years-old patient approached Ophthalmology Department with retinal detachment in her right eye and proliferative vitreoretinopathy stage D2. Her medical history revealed previous cryotherapy of her right eye, high myopia (-14.5 D), bilateral glaucoma, bilateral posterior subcapsular cataracts and subluxated crystalline lens in her righteye. Further clinical examination of her right eye revealed best corrected visual acuity of light perception without localization, intraocular pressure 45 mmHg. Patient underwent pars plana vitrectomy with subluxated crystalline lens facoaspiration and silicone oil injection of her righteye. After 2 months pars plana vitrectomy was repeated with removal of silicon oil and further SF6 endotamponade. During control examination 6 months later right’s eye best corrected visual acuity was 5/16, intraocular pressure 23 mmHg. In USG of her right eye remains of silicon oil were noticed with retina attached.ConclusionsPars plana vitrectomy with silicon oil injection is effective method of treatment of retinal detachement in patients with Stickler syndrome. Those operations might be followed by many complications. Early diagnosis is essential in prevention of ocular complications in patient with Stickler syndrome.

Witrektomia 23 G z podaniem iniekcji inhibitora czynnika wzrostu śródbłonka naczyniowego u chorego na jaskrę neowaskularną, z całkowitym odwarstwieniem siatkówki, krwotokiem do komory przedniej i komory ciała szklistego oka prawego – opis przypadku

IntroductionNeovascular glaucoma is a serious eye disease characterized by neovascularization of their is and anterior chamber angle. The most important risk factors for the development of neovascular glaucoma include retinal ischemia including that caused by proliferative diabetic retinopathy, central retinal vein occlusion, or retinal detachment.Material and MethodsA 61-year-old man with anterior chamber and vitreous chamber hemorrhage, recurrent total retinal detachment and advanced neovascular glaucoma in the right eye.ResultsVisual acuity recorded as hand motion, intraocular pressure measured by applanation tonometry 16 mmHg. The anterior segment showed massive anterior chamber hemorrhage and iris neovascularization. Ultrasound examination of the right eyeball in the B projection showed multiple diffuse extra echoes consistent with hemorrhage into the vitreous chamber and flat total retinal detachment. The patient was scheduled for anterior chamber washout, 23 G posterior vitrectomy with retinal endolaser, silicone oil endotamponade and injection of ranibizumab into the vitreous chamber of the right eye. During the first follow-up, an improvement in visual acuity to a level of 1/50 using Snellen arrays, stabilization of intraocular pressure to a level of 11 mmHg, and retinal adhesion was achieved.ConclusionsPars plana vitrectomy in patients with anterior chamber and vitreous chamber hemorrhage, retinal detachment and neovascular glaucoma is an effective surgical procedure for restoring useful visual acuity. In addition, ranibizumab injection has a direct effect on reducing the level of intraocular vascular endothelial growth factor and causes regression of neovascularization in the retina, angle and iris.

Indirect cylopexy in cases with cyclodialysis using flanged prolene cylopexy technique.

This study aims to describe a new technique of indirect cyclopexy in the treatment of cyclodialysis. Cases who had cyclodialysis for more than 3 h of extent and were resistant to medical treatment underwent flanged prolene cyclopexy (FPC) technique. Five cases were included in this study. Mean duration between the initial surgery and FPC was 4.6 ± 4.3 months. Hypotony maculopathy was present in all cases. All cases underwent FPC in combination with pars plana vitrectomy and silicone oil injection. Circumferential FPC was applied in four cases, while focal FPC was performed in one case. Postoperatively, no complications occurred, visual acuity increased in four cases, and cyclodialysis closed in all cases. In the follow-up, silicone oil was removed in three cases, but silicone oil could not be removed in two cases with ongoing hypotony. Preliminary results showed that FPC is a promising technique in the surgical treatment of cyclodialysis.

Post-injection necrotic phlegmon of the penis in a 13-year-old boy

The practice of injecting various substances into the tissues of the penis in order to increase its size is found among adult men in different countries. An analysis of domestic and world literature revealed only one publication of a clinical case of treatment of a 16-year-old teenager with penile oleogranuloma. A 13-year-old boy was admitted to the pediatric surgical department with complaints of pain and severe swelling of the penis. According to the patient (found out later), these symptoms appeared 3 days after injecting 4 ml of Vaseline oil with a syringe under the skin of the penis. Swelling and hyperemia of the skin appeared, the next day the temperature rose to 40 °C, dizziness, nausea appeared, there were repeated vomiting and loose stools. The cause of the disease was established only after detailed questioning in the department. Local status: the penis is sharply increased in volume due to pronounced vitreous edema, mainly along the dorsal surface, the skin is hyperemic with dark areas and detachment of the epidermis. Diagnosis: “Necrotizing phlegmon of the penis, condition after injections of Vaseline oil”. After medical preparation, surgery was performed. Under endotracheal anesthesia, a 2 cm incision was made along the dorsal surface of the penis. A turbid liquid of 35–40 ml was released from the wound cavity, drainage was done with rubber drains. After the operation, antibacterial therapy and dressings with hydrophobic ointment were carried out. The general condition of the child returned to normal, the wound was cleaned, a defect measuring 5 × 3 × 0.2 cm was formed. After 2 weeks, plastic surgery was performed according to the Diettel method: the foreskin was cut to the area distal to the granulating wound, the outer and inner leaves of the foreskin were sharply separated, a graft was formed from the outer layer and fixed to the wound. The postoperative period was favorable, healing was by primary intention. The patient was discharged in satisfactory condition on the twenty-fourth day from hospitalization. When examined after 4 months, the patient has no complaints; on the dorsum of the penis there is a normotrophic scar measuring 2 × 3.5 cm, which does not interfere with skin mobility. The introduction of foreign bodies under the skin of the penis, accompanied by serious complications, began to be practiced among adolescents. Therefore, this case report will be of interest not only for pediatric surgeons and urologists, but also for doctors of other specialties who may be approached by patients with changes in the penile area, since a true history cannot always be ascertained.